Alum Rock, California Climate
United States
Pop. 15,536 Elev. 44 m / 144 ft
TZ: America/Los_Angeles (UTC-7) ·
Alum Rock is largely arid, with warm summers peaking at 83°F (28°C) in August and cool winters around 39°F (4°C) in January. Precipitation occurs on roughly 25 days per year (20.4 in / 518 mm total). The city averages 220 sunny days per year. Ocean water temperatures reach 62°F (17°C) in summer.
| Temperature | 83°F (29°C) high | 39°F (4°C) low |
| Feels like | 86°F (30°C) high | 39°F (4°C) low |
| Rain | 25 days | 20.4 in (518 mm) /yr |
| Sky | 220 sunny | 17 stormy |
| Wind | 2.3 mph (1.0 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jan, Apr, May, Jun, Jul, Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
28
Jan 65
Feb 61
Mar 49
Apr 26
May 13
Jun 18
Jul 14
Aug 33
Sep 34
Oct 51
Nov 48
Dec Humidity (%)
56
Jan 71
Feb 71
Mar 66
Apr 57
May 56
Jun 60
Jul 57
Aug 62
Sep 68
Oct 74
Nov 78
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 6 mi Norman Y. Mineta San Jose International Airport (SJC)
Ski resort 117 mi Leland Snowplay
National park 29 mi Santa Cruz Mission State Historic Park
Mountain peak
(5,082 ft) 74 mi Chews Ridge
Hospital 1 mi Regional Medical Center of San Jose
Hiking trail 12 mi Bay Area Ridge Trail - 03 - South Bay
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 61°F 16°C | 39°F 4°C | 0.5 in 11 mm | — | 22 |
| February | 60°F 16°C | 42°F 6°C | 5.8 in 147 mm | 0.5 in13 mm | 5 |
| March | 61°F 16°C | 43°F 6°C | 3.7 in 94 mm | 0.2 in6 mm | 7 |
| April | 67°F 20°C | 46°F 8°C | 0.9 in 22 mm | — | 11 |
| May | 76°F 24°C | 50°F 10°C | 0.1 in 3 mm | — | 23 |
| June | 78°F 26°C | 52°F 11°C | 0.0 in 0 mm | — | 30 |
| July | 79°F 26°C | 55°F 13°C | 0.0 in 0 mm | — | 28 |
| August | 83°F 29°C | 58°F 14°C | 0.0 in 1 mm | — | 30 |
| September | 81°F 27°C | 59°F 15°C | 0.2 in 6 mm | — | 20 |
| October | 72°F 22°C | 51°F 11°C | 1.6 in 41 mm | — | 19 |
| November | 65°F 18°C | 47°F 9°C | 4.4 in 112 mm | — | 12 |
| December | 58°F 15°C | 44°F 7°C | 3.1 in 80 mm | — | 13 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 22 | 0 |
| February | 5 | 5 |
| March | 7 | 3 |
| April | 11 | 1 |
| May | 23 | 0 |
| June | 30 | 0 |
| July | 28 | 0 |
| August | 30 | 0 |
| September | 20 | 0 |
| October | 19 | 2 |
| November | 12 | 3 |
| December | 13 | 3 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 55°F 13°C | 48°F 9°C |
| February | 54°F 12°C | 48°F 9°C |
| March | 54°F 12°C | 50°F 10°C |
| April | 55°F 13°C | 55°F 13°C |
| May | 55°F 13°C | 61°F 16°C |
| June | 57°F 14°C | 66°F 19°C |
| July | 58°F 15°C | 70°F 21°C |
| August | 60°F 15°C | 72°F 22°C |
| September | 61°F 16°C | 71°F 21°C |
| October | 62°F 17°C | 63°F 17°C |
| November | 58°F 14°C | 58°F 14°C |
| December | 58°F 14°C | 52°F 11°C |